update-kernel.in 1.84 KB
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#!/bin/sh -e

# update-kernel
#
# Kernel and firmware update script for Alpine installations set up
# with setup-bootable
#
# Copyright (c) 2014 Timo Teräs
# Copyright (c) 2014 Kaarle Ritvanen


TMPDIR=
SIGNALS="HUP INT TERM"
SCRIPT=update-kernel
VIRTUAL=.tmp-$SCRIPT

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DESTDIR=$1
MNTDIR=

if [ -z "$DESTDIR" ]; then
    while read MOUNT; do
	set -- $MOUNT
	[ $2 = /.modloop ] || continue
	DESTDIR=$(dirname $(losetup $1 | cut -d " " -f 3))
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	MNTDIR=$(dirname "$DESTDIR")
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	break
    done < /proc/mounts

    if [ -z "$MNTDIR" ]; then
	echo "Module loopback device not mounted" >&2
	exit 1
    fi
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fi

remount() {
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    mount $1 -o remount "$MNTDIR"
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}


ignore_sigs() {
    trap "" $SIGNALS
}

clean_up() {
    set +e
    ignore_sigs

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    apk del -q $VIRTUAL
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    rm -fr "$TMPDIR"
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}

trap clean_up EXIT $SIGNALS


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apk add -qU -t $VIRTUAL mkinitfs squashfs-tools
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. /etc/mkinitfs/mkinitfs.conf

ARCH=$(apk --print-arch)
FLAVOR=$(uname -r | cut -d - -f 3-)
TMPDIR=$(mktemp -dt $SCRIPT.XXXXXX)
ROOT=$TMPDIR/root

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_apk() {
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    apk add -q -p "$ROOT" --no-scripts --arch $ARCH --keys-dir /etc/apk/keys \
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	--repositories-file /etc/apk/repositories $*
}

_apk -U --initdb alpine-base linux-$FLAVOR linux-firmware
_apk dahdi-linux dahdi-linux-$FLAVOR || :
_apk xtables-addons-$FLAVOR || :

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KVER=$(ls "$ROOT/lib/modules")
depmod -b "$ROOT" $KVER
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STAGING=$TMPDIR/boot
MODLOOP=$TMPDIR/modloop
MODIMG=$FLAVOR.modloop.squashfs

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mkdir "$MODLOOP" "$STAGING"
cp -a "$ROOT/lib/modules" "$MODLOOP"
cp -a "$ROOT/lib/firmware" "$MODLOOP/modules"
mksquashfs "$MODLOOP" "$STAGING/$MODIMG" -comp xz
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mkinitfs -q -F "$features squashfs" -b "$ROOT" -o "$STAGING/$FLAVOR.gz" $KVER
cp "$ROOT/boot/vmlinuz-$FLAVOR" "$STAGING/$FLAVOR"
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if [ "$MNTDIR" ]; then
    ignore_sigs
    remount -w
    rm -f "$DESTDIR/$MODIMG"
fi
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mv "$STAGING"/* "$DESTDIR"
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if [ "$MNTDIR" ]; then
    set +e
    sync
    remount -r
fi
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exit 0